president obama was briefed overnight by his homeland security adviser lisa monaco. she will be briefing him again this morning, along with fbi director robert mueller. as well his attorney general eric holder. we've learned that president obama is going to this memorial service in boston, an interfaith memorial service to remember those victims of the -- of the bombing. those who were killed. those who were seriously injured. this will be at the cathedral of the holy cross tomorrow. it's going to be an emotional event. we've already sort of gotten a sense of maybe some of the, i guess stories that he may touch on. he was talking yesterday about how some folks who had run the marathon, even after going through that grueling race, went to hospitals to donate blood for people who were suffering, who were gravely injured, in the wake of the bombings. these are some of the certainly some of the tones, and some of the themes that he will be triking tomorrow, chris. >> our thanks to brianna keilar at the white house this morning. again, we have some new information from cn